American Telephone & Telegraph Company, as Successor in Interest to at & T Information Systems, Plaintiff-Counter-Defendant-Appellee v. United Computer Systems, Inc. Defendant-Counter-Claimant-Appellant. American Telephone & Telegraph Company, as Successor in Interest to at & T Information Systems, Inc. v. United Computer Systems, Inc. North American Timeshare, Inc., Dba United Computer Systems · Ninth Circuit Court of Appeals · 1993 | Caselegis